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Single-well coalbed methane horizontal well system and finishing method thereof

A technology for horizontal wells and coalbed methane, which is applied in wellbore/well components, earthwork drilling, and fluid production, etc., can solve problems such as waste of resources, increase drilling costs, and increase floor space, so as to avoid waste of resources and reduce wells. Effects of site footprint and drilling costs

Inactive Publication Date: 2013-06-19
CHINA UNITED COALBED METHANE NAT ENGRES CENT +1
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Problems solved by technology

[0004] The present invention provides a single wellbore coalbed methane horizontal well system and its completion method to solve the problems of requiring two wellbores in the prior art, increasing floor space, increasing drilling costs and causing waste of resources

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  • Single-well coalbed methane horizontal well system and finishing method thereof
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  • Single-well coalbed methane horizontal well system and finishing method thereof

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Embodiment Construction

[0024] In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0025] The core idea of ​​the present invention is to develop coalbed methane by using a single borehole horizontal well system, and the specific technical solution is to complete a horizontal wellbore, and use the borehole to provide drainage channels for coal seams and desorption channels for coalbed methane. Then sidedrill the branch pockets in the horizontal wellbore, and use the branch pockets to realize the function of collecting the pulverized coal produced in the coal seam in the production vertical well in the prior art, while the drainage in the production vertical wells in the prior art The equipment was lowered in a horizontal well instead. Thereby realized the function of two wells of prior art with one well.

[0026] i...

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Abstract

The invention discloses a single-well coalbed methane horizontal well system and a finishing method thereof. The horizontal well system particularly comprises a horizontal well and a branch pocket section (L4), wherein the horizontal well comprises a vertical well section (L1), a deflecting section (L2) and a horizontal section (L3), and the branch pocket section (L4) which is used for collecting coal powder is formed through that side tracking is conducted on a pointed side tracking point of the horizontal well. The finishing method of the horizontal well system particularly includes the steps of finishing the horizontal well which comprises the vertical well section (L1), the deflecting section (L2) and the horizontal section (L3), and carrying out the side tracking on the pointed side tracking point of the horizontal well to finish the branch pocket section (L4). Compared with the prior art that the function of developing coalbed methane is achieved through two wells, the single-well coalbed methane horizontal well system achieves the function only through one well, and has the advantages of reducing covering area and well drilling cost, and avoiding waste.

Description

technical field [0001] The invention relates to the field of coalbed methane exploration and development, in particular to a coalbed methane horizontal well system and a completion method thereof. Background technique [0002] At present, there are two main well types in the exploitation of coalbed methane horizontal wells, such as figure 1 and 2 As shown in the figure: figure 1 Schematic diagram of a coalbed methane wellbore developed for a multilateral horizontal well; figure 2 Schematic diagram of CBM wellbore development for U-shaped wells. A multi-branch horizontal well refers to constructing a production vertical well 103 at a well site on the surface 101 first, and then constructing a horizontal well 102 at another well site on the ground 101. The multi-branch horizontal well 102 is drilled, and the multi-branch horizontal well 102 is used to provide drainage and desorption channels for the coal seam. On the one hand, the production vertical well 103 can perform...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/30
Inventor 毛志新鲜保安王德桂彭宏钊邓钧耀毕延森纪元张毅
Owner CHINA UNITED COALBED METHANE NAT ENGRES CENT
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